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Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Dihadron fragmentation functions for large invariant mass.

J Zhou1, A Metz

  • 1Department of Physics, Temple University, Philadelphia, Pennsylvania 19122-6082, USA.

Physical Review Letters
|June 4, 2011
PubMed
Summary
This summary is machine-generated.

We computed dihadron fragmentation functions using perturbative quantum chromodynamics. The study highlights the interference fragmentation function H(1)(∢) and its relation to nucleon spin physics and the Collins fragmentation function.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Nuclear Physics

Background:

  • Dihadron fragmentation functions are crucial for understanding particle production in high-energy collisions.
  • The interference fragmentation function H(1)(∢) is particularly important for nucleon spin physics.
  • Previous studies have explored single-hadron fragmentation, but dihadron systems offer richer dynamics.

Purpose of the Study:

  • To compute dihadron fragmentation functions for large invariant masses using perturbative quantum chromodynamics.
  • To investigate the role and dynamics of the interference fragmentation function H(1)(∢).
  • To compare collinear factorization approaches for dihadron and single-hadron fragmentation.

Main Methods:

  • Perturbative quantum chromodynamics calculations were employed.
  • Analysis focused on the interference fragmentation function H(1)(∢).
  • Semi-inclusive deep-inelastic scattering was considered to compare factorization schemes.

Main Results:

  • Dihadron fragmentation functions were computed for large invariant masses.
  • The interference fragmentation function H(1)(∢) was found to share dynamics with the Collins fragmentation function.
  • Collinear factorization yields consistent results for both dihadron and single-hadron fragmentation at intermediate invariant masses.

Conclusions:

  • The study provides new insights into dihadron fragmentation functions and their connection to nucleon spin.
  • The close relationship between H(1)(∢) and the Collins function suggests unified dynamics.
  • The consistency of factorization approaches validates their application in different kinematic regimes.